Re: Style, Substance and Typing in Schemas
Andrew Welch scripsit: > > Since in Java, URI is not a subclass of String, it make sense that anyURI in XSD should not be a subclass of String. > > That's probably (see above) because you don't want URI inheriting all > the methods in String. For a variety of reasons, String can have no subclasses in Java. The most important of these is that Strings are immutable (and therefore safely shareable between threads), and for an immutable class to have potentially mutable subclasses is asking for trouble. But of course this has nothing to do with XSD datatypes. > Yeah that seems reasonable... what I don't understand is why '' (empty > quotes) is a legal xs:string and xs:anyURI, when is that useful? A string can be of any length, including zero. An empty string when interpreted as a URI is basically a reference to the current base URI. -- Some people open all the Windows; John Cowan wise wives welcome the spring firstname.lastname@example.org by moving the Unix. http://www.ccil.org/~cowan --ad for Unix Book Units (U.K.) (see http://cm.bell-labs.com/cm/cs/who/dmr/unix3image.gif)
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